... group tester for transformerthe tester for transformer is a newly developed kind of transformation ratio auto tester, a fruit of all the ... measurement of transformation ratio, group (polarity), error of groups of transformer in model of Δ/Y,Y/Δ,Y/Y,Δ/Δ,Y/Z,Z ... °C Humidity 85%RHDisplay digital displayDimensions 400×300×150mm3Weight 10kg transformer Ratio Test